Rule 1: Madd muttaṣil: the obligatory connected madd
When the hamza follows the madd letter inside the same word, the madd is wājib, obligatory: every reciter lengthens it. In the recitation of Ḥafṣ it is held for four or five counts; choose one and keep it. If the hamza is the last letter of the word and you stop on it, you may lengthen to six counts, since the stop adds a sukūn after the madd.
إِذَا جَاءَ
idhā jāʾa
when there comes
ā then hamza in one word: four or five counts (110:1).
وَالسَّمَاءِ
was-samāʾi
by the sky
madd muttaṣil at the end of a word; six counts if you stop here (86:1).
اَلسَّائِلَ
as-sāʾila
the one who asks
muttaṣil in the middle of the word (93:10).
أُولَٰٓئِكَ
ulāʾika
those
the dagger alif over ل is followed by hamza in the same word: muttaṣil (2:5).
يَتَسَاءَلُونَ
yatasāʾalūna
they ask one another
muttaṣil on سَاءَ (78:1).
مَاءً ثَجَّاجًا
māʾan thajjājā
pouring water
muttaṣil on مَاءً (78:14).